Cathode ray tube plate assembly



April 3, 1945.

S; J. KOCH ETAL CATHODE RAY TUBE PLATE ASSEMBLY I Filed July 8, 1942Patented Apr. 3, 1945 CATHODE RAY TUBE PLATE ASSEBIBLY Stanley J. Koch,Clifton, and Robert E..-Rutherford, Rutherford, N. J assignors to AllenB. Du Mont Laboratories, Inc., Passaic, N. J., a. corporation ofDelaware Application July 8, 1942, Serial No. 450,116

Claims.

This invention relates to the assembly of the pairs of deflection platesof cathode ray tubes in such a way that the danger of the pairs ofplates becoming displaced with respect to each other is greatlydecreased or entirely eliminated.

Heretofore such plates have been attached along their lower edges to theupper ends of wires which passed through a mica disc having eyelets towhich the wires were attached. The

upper pair of plates were spaced a considerable distance from the discsupport, thus incurring the hazard of the pairs of plates becomingdisplaced with respect to each other with resulting distortion of thecathode ray beamand producing a misleading trace on the face of thetube.

It is highly important that the pairs of plates should be kept exactlyat right angles to each other for accuracy of readings. This object isaccomplished by this invention by having all of the wires pass throughtwo holders in the form i of discs located on opposite sides of one ofsaid pairs of plates and having one set of wires passing through thispair of plates and attached thereto. The upper pair of plates is fixedlymounted with respect to the upper disc and the other pair is fixedlymounted on wires that pass through the plates and through both discs sothat the upper disc and pair of plates are restrained from' turningcircumferentially, and even if they should be turned the disc wouldcarry along the other wires to which the other pair of plates isattached so that the pairs would still maintain practically their rightangle relationship to each other.

The invention may be understood from the description in connection withthe accompanying drawings, in which:

Fig. 1 is a plan view of the device;

Fig. 2 is a side view thereof; and

Fig. 3 is a side View taken at right angles to Fig. 2.

In the drawing, reference character I indicates a pair of deflectingplates for the cathode ray, and character 2 indicates a second pair thatis located at right angles to the first pair. Mica discs 3 and 4 arespaced apart, and each is pro-'- vided with a number of holes witheyelets 5 anchored therein through which wires or rods 6 and I extendand are soldered or otherwise attached to the eyelets. The four wires 6support the plates I, and the four wires 1 support the plates 2, twowires supporting each plate at some distance from the centers thereof inthe usual way. Narrow strips 8 are provided along the lower outer edgesof the plates I and are bent around the wires 6 and are attached both tothe wires and the plate by soldering or any other convenient way.Similar strips 9 extend along the lower edges of the plates 2 and areattached thereto and to the wires 1 in a similar way. Elongated openingsH] are provided through the outwardly extending portions of the plates 2through which the wires 1 pass.

The extensions H are provided on the discs 3 and 4 and have holes l2therethrough for the purpose of locating thin strips of mica or mica andsteel so that the ends thereof rest against the inside wall of the neckof the tube in which the plates are installed so as to keep the sameaccurately centered in the usual way.

In view of the fact that the wires 1 which support the plates 2 areanchored in the discs 3 and 4 both below and above these plates, andthese wires are spaced a considerable distance apart longitudinally ofthe plates 2, and the wires 6 also pass through both of these discs 3and 4 and are anchored thereto and also keep the plates l in position,the pairs of plates I and 2 are kept permanently at right angles to eachother after they have once been adjusted.

What is claimed is: 1. A support for pairs of cathode ray deflectionplates, comprising sets of wires anchored in place above and below oneof said pairs of plates, one set of said wires passing through thedeflecting surface of one of said pairs of plates and supporting it.

2. A support for pairs of cathode ray deflection plates, comprising setsof wires, discs on opposite sides of one of said pairs of platesanchoring said wires in place above and below one of said pairs ofplates, one set of said wires passing through the deflecting surfaces ofone of said pairs of plates and supporting it and the other setterminating near the lower edge of the other pair of plates andsupporting the pair.

3. A support for pairs of cathode ray deflection plates, comprising setsof wires with two pairs of wires in each set anchored in place above andbelow one of said pairs of plates, each plate having a portion parallelto and attached to a pair of said wires and a portion lying at an angleto said pair of wires, said pair of wires extending in a plane whichcuts across said last named portion.

4. A support for two pairs of cathode ray tube deflection plates,comprising wires and two discs of insulating material, said discs beinglocated near opposite edges of one of said pairs of plates, and one ofsaid discs being located between said pairs of plates.

5. The device of claim 4, in which .the wires supporting one pair ofplates pass through said plates.

STANLEY J. KOCH. ROBERT E. RUTHERFORD.

